opcom only brakes cars if you mess with immobilisers and then delete all the keys so then you can't start the car lol
opcom is better used as a fault finding tool as i said before its programing functions or useless at best unless you have a vec c /astra h
it was unable to program a brand new headlamp leveling sensor for me and i ended up going to vx and having it coded for free when i said they could have it back as it was no use to me unprogrammed
you could probably get a zaf a ecu/key/receiver that has cc on from ebay for like £25